Abstract: Adsorption and leaching of sodium penicillin in soils and their affecting factors were studied with the vibrating equilibrium method and the column leaching method. Results show that adsorptions of the substance in red soil from Jiangxi, paddy soil from Taihu and black soil from Northeast China at 25℃ or below, were fairly well fitted with the Freundlic model with adsorption constant being 30.73, 39.26 and 64.58 mL·g^-1, respectively. PLS (partial least squares) analysis reveals that soil clay and organic matter were the key factors affecting soil adsorption of sodium penicillin in the soils. Free energies of sodium penicillin adsorption in all the three soils were less than 40 kJ·mol^-1, suggesting that the adsorption belonged to the type of physical adsorption. The soils followed an order of Northeast China black soil > Taihu region paddy soil > Jiangxi red soil in terms of sodium penicillin adsorption capacity. The leaching experiment indicates that the content of soil clay and the content of organic matter are also the two factors affecting leaching of sodium penicillin in soils, and that the three soils followed an order of Jiangxi red soil > Taihu region paddy soil > Northeast China black soil in terms of sodium penicillin movability in the soil profiles.

Key words: sodium penicillin, adsorption, leaching, soil